1 /* 2 * Linux INET6 implementation 3 * 4 * Authors: 5 * Pedro Roque <roque@di.fc.ul.pt> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #ifndef _NET_IPV6_H 14 #define _NET_IPV6_H 15 16 #include <linux/ipv6.h> 17 #include <linux/hardirq.h> 18 #include <net/if_inet6.h> 19 #include <net/ndisc.h> 20 #include <net/flow.h> 21 #include <net/snmp.h> 22 23 #define SIN6_LEN_RFC2133 24 24 25 #define IPV6_MAXPLEN 65535 26 27 /* 28 * NextHeader field of IPv6 header 29 */ 30 31 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ 32 #define NEXTHDR_TCP 6 /* TCP segment. */ 33 #define NEXTHDR_UDP 17 /* UDP message. */ 34 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ 35 #define NEXTHDR_ROUTING 43 /* Routing header. */ 36 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ 37 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */ 38 #define NEXTHDR_AUTH 51 /* Authentication header. */ 39 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ 40 #define NEXTHDR_NONE 59 /* No next header */ 41 #define NEXTHDR_DEST 60 /* Destination options header. */ 42 #define NEXTHDR_MOBILITY 135 /* Mobility header. */ 43 44 #define NEXTHDR_MAX 255 45 46 47 48 #define IPV6_DEFAULT_HOPLIMIT 64 49 #define IPV6_DEFAULT_MCASTHOPS 1 50 51 /* 52 * Addr type 53 * 54 * type - unicast | multicast 55 * scope - local | site | global 56 * v4 - compat 57 * v4mapped 58 * any 59 * loopback 60 */ 61 62 #define IPV6_ADDR_ANY 0x0000U 63 64 #define IPV6_ADDR_UNICAST 0x0001U 65 #define IPV6_ADDR_MULTICAST 0x0002U 66 67 #define IPV6_ADDR_LOOPBACK 0x0010U 68 #define IPV6_ADDR_LINKLOCAL 0x0020U 69 #define IPV6_ADDR_SITELOCAL 0x0040U 70 71 #define IPV6_ADDR_COMPATv4 0x0080U 72 73 #define IPV6_ADDR_SCOPE_MASK 0x00f0U 74 75 #define IPV6_ADDR_MAPPED 0x1000U 76 #define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */ 77 78 /* 79 * Addr scopes 80 */ 81 #ifdef __KERNEL__ 82 #define IPV6_ADDR_MC_SCOPE(a) \ 83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 84 #define __IPV6_ADDR_SCOPE_INVALID -1 85 #endif 86 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 87 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 88 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 89 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 90 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e 91 92 /* 93 * fragmentation header 94 */ 95 96 struct frag_hdr { 97 __u8 nexthdr; 98 __u8 reserved; 99 __be16 frag_off; 100 __be32 identification; 101 }; 102 103 #define IP6_MF 0x0001 104 105 #ifdef __KERNEL__ 106 107 #include <net/sock.h> 108 109 /* sysctls */ 110 extern int sysctl_mld_max_msf; 111 extern struct ctl_path net_ipv6_ctl_path[]; 112 113 #define _DEVINC(statname, modifier, idev, field) \ 114 ({ \ 115 struct inet6_dev *_idev = (idev); \ 116 if (likely(_idev != NULL)) \ 117 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ 118 SNMP_INC_STATS##modifier(statname##_statistics, (field)); \ 119 }) 120 121 #define _DEVADD(statname, modifier, idev, field, val) \ 122 ({ \ 123 struct inet6_dev *_idev = (idev); \ 124 if (likely(_idev != NULL)) \ 125 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ 126 SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\ 127 }) 128 129 /* MIBs */ 130 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics); 131 132 #define IP6_INC_STATS(idev,field) _DEVINC(ipv6, , idev, field) 133 #define IP6_INC_STATS_BH(idev,field) _DEVINC(ipv6, _BH, idev, field) 134 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val) 135 136 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics); 137 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics); 138 139 #define ICMP6_INC_STATS(idev, field) _DEVINC(icmpv6, , idev, field) 140 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field) 141 142 #define ICMP6MSGOUT_INC_STATS(idev, field) \ 143 _DEVINC(icmpv6msg, , idev, field +256) 144 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \ 145 _DEVINC(icmpv6msg, _BH, idev, field +256) 146 #define ICMP6MSGIN_INC_STATS(idev, field) \ 147 _DEVINC(icmpv6msg, , idev, field) 148 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \ 149 _DEVINC(icmpv6msg, _BH, idev, field) 150 151 struct ip6_ra_chain 152 { 153 struct ip6_ra_chain *next; 154 struct sock *sk; 155 int sel; 156 void (*destructor)(struct sock *); 157 }; 158 159 extern struct ip6_ra_chain *ip6_ra_chain; 160 extern rwlock_t ip6_ra_lock; 161 162 /* 163 This structure is prepared by protocol, when parsing 164 ancillary data and passed to IPv6. 165 */ 166 167 struct ipv6_txoptions 168 { 169 /* Length of this structure */ 170 int tot_len; 171 172 /* length of extension headers */ 173 174 __u16 opt_flen; /* after fragment hdr */ 175 __u16 opt_nflen; /* before fragment hdr */ 176 177 struct ipv6_opt_hdr *hopopt; 178 struct ipv6_opt_hdr *dst0opt; 179 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 180 struct ipv6_opt_hdr *dst1opt; 181 182 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 183 }; 184 185 struct ip6_flowlabel 186 { 187 struct ip6_flowlabel *next; 188 __be32 label; 189 atomic_t users; 190 struct in6_addr dst; 191 struct ipv6_txoptions *opt; 192 unsigned long linger; 193 u8 share; 194 u32 owner; 195 unsigned long lastuse; 196 unsigned long expires; 197 struct net *fl_net; 198 }; 199 200 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF) 201 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF) 202 203 struct ipv6_fl_socklist 204 { 205 struct ipv6_fl_socklist *next; 206 struct ip6_flowlabel *fl; 207 }; 208 209 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 210 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 211 struct ip6_flowlabel * fl, 212 struct ipv6_txoptions * fopt); 213 extern void fl6_free_socklist(struct sock *sk); 214 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 215 extern int ip6_flowlabel_init(void); 216 extern void ip6_flowlabel_cleanup(void); 217 218 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 219 { 220 if (fl) 221 atomic_dec(&fl->users); 222 } 223 224 extern int ip6_ra_control(struct sock *sk, int sel); 225 226 extern int ipv6_parse_hopopts(struct sk_buff *skb); 227 228 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 229 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, 230 int newtype, 231 struct ipv6_opt_hdr __user *newopt, 232 int newoptlen); 233 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 234 struct ipv6_txoptions *opt); 235 236 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb); 237 238 int ip6_frag_nqueues(struct net *net); 239 int ip6_frag_mem(struct net *net); 240 241 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */ 242 243 extern int __ipv6_addr_type(const struct in6_addr *addr); 244 static inline int ipv6_addr_type(const struct in6_addr *addr) 245 { 246 return __ipv6_addr_type(addr) & 0xffff; 247 } 248 249 static inline int ipv6_addr_scope(const struct in6_addr *addr) 250 { 251 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 252 } 253 254 static inline int __ipv6_addr_src_scope(int type) 255 { 256 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16)); 257 } 258 259 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 260 { 261 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 262 } 263 264 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 265 { 266 return memcmp(a1, a2, sizeof(struct in6_addr)); 267 } 268 269 static inline int 270 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 271 const struct in6_addr *a2) 272 { 273 return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 274 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 275 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 276 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]))); 277 } 278 279 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 280 { 281 memcpy(a1, a2, sizeof(struct in6_addr)); 282 } 283 284 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 285 const struct in6_addr *addr, 286 int plen) 287 { 288 /* caller must guarantee 0 <= plen <= 128 */ 289 int o = plen >> 3, 290 b = plen & 0x7; 291 292 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 293 memcpy(pfx->s6_addr, addr, o); 294 if (b != 0) 295 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 296 } 297 298 static inline void ipv6_addr_set(struct in6_addr *addr, 299 __be32 w1, __be32 w2, 300 __be32 w3, __be32 w4) 301 { 302 addr->s6_addr32[0] = w1; 303 addr->s6_addr32[1] = w2; 304 addr->s6_addr32[2] = w3; 305 addr->s6_addr32[3] = w4; 306 } 307 308 static inline int ipv6_addr_equal(const struct in6_addr *a1, 309 const struct in6_addr *a2) 310 { 311 return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 312 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 313 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 314 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0); 315 } 316 317 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2, 318 unsigned int prefixlen) 319 { 320 unsigned pdw, pbi; 321 322 /* check complete u32 in prefix */ 323 pdw = prefixlen >> 5; 324 if (pdw && memcmp(a1, a2, pdw << 2)) 325 return 0; 326 327 /* check incomplete u32 in prefix */ 328 pbi = prefixlen & 0x1f; 329 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 330 return 0; 331 332 return 1; 333 } 334 335 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 336 const struct in6_addr *a2, 337 unsigned int prefixlen) 338 { 339 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 340 prefixlen); 341 } 342 343 struct inet_frag_queue; 344 345 struct ip6_create_arg { 346 __be32 id; 347 struct in6_addr *src; 348 struct in6_addr *dst; 349 }; 350 351 void ip6_frag_init(struct inet_frag_queue *q, void *a); 352 int ip6_frag_match(struct inet_frag_queue *q, void *a); 353 354 static inline int ipv6_addr_any(const struct in6_addr *a) 355 { 356 return ((a->s6_addr32[0] | a->s6_addr32[1] | 357 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 358 } 359 360 static inline int ipv6_addr_loopback(const struct in6_addr *a) 361 { 362 return ((a->s6_addr32[0] | a->s6_addr32[1] | 363 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0); 364 } 365 366 static inline int ipv6_addr_v4mapped(const struct in6_addr *a) 367 { 368 return ((a->s6_addr32[0] | a->s6_addr32[1] | 369 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0); 370 } 371 372 /* 373 * Check for a RFC 4843 ORCHID address 374 * (Overlay Routable Cryptographic Hash Identifiers) 375 */ 376 static inline int ipv6_addr_orchid(const struct in6_addr *a) 377 { 378 return ((a->s6_addr32[0] & htonl(0xfffffff0)) 379 == htonl(0x20010010)); 380 } 381 382 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 383 struct in6_addr *v4mapped) 384 { 385 ipv6_addr_set(v4mapped, 386 0, 0, 387 htonl(0x0000FFFF), 388 addr); 389 } 390 391 /* 392 * find the first different bit between two addresses 393 * length of address must be a multiple of 32bits 394 */ 395 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 396 { 397 const __be32 *a1 = token1, *a2 = token2; 398 int i; 399 400 addrlen >>= 2; 401 402 for (i = 0; i < addrlen; i++) { 403 __be32 xb = a1[i] ^ a2[i]; 404 if (xb) 405 return i * 32 + 32 - fls(ntohl(xb)); 406 } 407 408 /* 409 * we should *never* get to this point since that 410 * would mean the addrs are equal 411 * 412 * However, we do get to it 8) And exacly, when 413 * addresses are equal 8) 414 * 415 * ip route add 1111::/128 via ... 416 * ip route add 1111::/64 via ... 417 * and we are here. 418 * 419 * Ideally, this function should stop comparison 420 * at prefix length. It does not, but it is still OK, 421 * if returned value is greater than prefix length. 422 * --ANK (980803) 423 */ 424 return (addrlen << 5); 425 } 426 427 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 428 { 429 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 430 } 431 432 /* 433 * Prototypes exported by ipv6 434 */ 435 436 /* 437 * rcv function (called from netdevice level) 438 */ 439 440 extern int ipv6_rcv(struct sk_buff *skb, 441 struct net_device *dev, 442 struct packet_type *pt, 443 struct net_device *orig_dev); 444 445 extern int ip6_rcv_finish(struct sk_buff *skb); 446 447 /* 448 * upper-layer output functions 449 */ 450 extern int ip6_xmit(struct sock *sk, 451 struct sk_buff *skb, 452 struct flowi *fl, 453 struct ipv6_txoptions *opt, 454 int ipfragok); 455 456 extern int ip6_nd_hdr(struct sock *sk, 457 struct sk_buff *skb, 458 struct net_device *dev, 459 const struct in6_addr *saddr, 460 const struct in6_addr *daddr, 461 int proto, int len); 462 463 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 464 465 extern int ip6_append_data(struct sock *sk, 466 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 467 void *from, 468 int length, 469 int transhdrlen, 470 int hlimit, 471 int tclass, 472 struct ipv6_txoptions *opt, 473 struct flowi *fl, 474 struct rt6_info *rt, 475 unsigned int flags); 476 477 extern int ip6_push_pending_frames(struct sock *sk); 478 479 extern void ip6_flush_pending_frames(struct sock *sk); 480 481 extern int ip6_dst_lookup(struct sock *sk, 482 struct dst_entry **dst, 483 struct flowi *fl); 484 extern int ip6_dst_blackhole(struct sock *sk, 485 struct dst_entry **dst, 486 struct flowi *fl); 487 extern int ip6_sk_dst_lookup(struct sock *sk, 488 struct dst_entry **dst, 489 struct flowi *fl); 490 491 /* 492 * skb processing functions 493 */ 494 495 extern int ip6_output(struct sk_buff *skb); 496 extern int ip6_forward(struct sk_buff *skb); 497 extern int ip6_input(struct sk_buff *skb); 498 extern int ip6_mc_input(struct sk_buff *skb); 499 500 extern int __ip6_local_out(struct sk_buff *skb); 501 extern int ip6_local_out(struct sk_buff *skb); 502 503 /* 504 * Extension header (options) processing 505 */ 506 507 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 508 struct ipv6_txoptions *opt, 509 u8 *proto, 510 struct in6_addr **daddr_p); 511 extern void ipv6_push_frag_opts(struct sk_buff *skb, 512 struct ipv6_txoptions *opt, 513 u8 *proto); 514 515 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 516 u8 *nexthdrp); 517 518 extern int ipv6_ext_hdr(u8 nexthdr); 519 520 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 521 522 /* 523 * socket options (ipv6_sockglue.c) 524 */ 525 526 extern int ipv6_setsockopt(struct sock *sk, int level, 527 int optname, 528 char __user *optval, 529 int optlen); 530 extern int ipv6_getsockopt(struct sock *sk, int level, 531 int optname, 532 char __user *optval, 533 int __user *optlen); 534 extern int compat_ipv6_setsockopt(struct sock *sk, 535 int level, 536 int optname, 537 char __user *optval, 538 int optlen); 539 extern int compat_ipv6_getsockopt(struct sock *sk, 540 int level, 541 int optname, 542 char __user *optval, 543 int __user *optlen); 544 545 extern int ip6_datagram_connect(struct sock *sk, 546 struct sockaddr *addr, int addr_len); 547 548 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 549 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 550 u32 info, u8 *payload); 551 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 552 553 extern int inet6_release(struct socket *sock); 554 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 555 int addr_len); 556 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 557 int *uaddr_len, int peer); 558 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 559 unsigned long arg); 560 561 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 562 struct sock *sk); 563 564 /* 565 * reassembly.c 566 */ 567 extern const struct proto_ops inet6_stream_ops; 568 extern const struct proto_ops inet6_dgram_ops; 569 570 struct group_source_req; 571 struct group_filter; 572 573 extern int ip6_mc_source(int add, int omode, struct sock *sk, 574 struct group_source_req *pgsr); 575 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 576 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 577 struct group_filter __user *optval, 578 int __user *optlen); 579 580 #ifdef CONFIG_PROC_FS 581 extern int ac6_proc_init(struct net *net); 582 extern void ac6_proc_exit(struct net *net); 583 extern int raw6_proc_init(void); 584 extern void raw6_proc_exit(void); 585 extern int tcp6_proc_init(struct net *net); 586 extern void tcp6_proc_exit(struct net *net); 587 extern int udp6_proc_init(struct net *net); 588 extern void udp6_proc_exit(struct net *net); 589 extern int udplite6_proc_init(void); 590 extern void udplite6_proc_exit(void); 591 extern int ipv6_misc_proc_init(void); 592 extern void ipv6_misc_proc_exit(void); 593 extern int snmp6_register_dev(struct inet6_dev *idev); 594 extern int snmp6_unregister_dev(struct inet6_dev *idev); 595 596 #else 597 static inline int ac6_proc_init(struct net *net) { return 0; } 598 static inline void ac6_proc_exit(struct net *net) { } 599 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 600 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 601 #endif 602 603 #ifdef CONFIG_SYSCTL 604 extern ctl_table ipv6_route_table_template[]; 605 extern ctl_table ipv6_icmp_table_template[]; 606 607 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 608 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net); 609 extern int ipv6_sysctl_register(void); 610 extern void ipv6_sysctl_unregister(void); 611 #endif 612 613 #endif /* __KERNEL__ */ 614 #endif /* _NET_IPV6_H */ 615